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Ruby Gem Creme Fraiche 0.6 Command Injection

Ruby Gem Creme Fraiche 0.6 Command Injection
Posted May 14, 2013
Authored by Larry W. Cashdollar

Ruby Gem Creme Fraiche version 0.6 suffers from a remote command injection vulnerability due to unsanitized input.

tags | exploit, remote, ruby
advisories | CVE-2013-2090
SHA-256 | 432f99098884e80c6594d67b9edd44d3c6a943e78df04188f65f7a5a60c25b58

Ruby Gem Creme Fraiche 0.6 Command Injection

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TITLE: Remote command Injection in Creme Fraiche 0.6 Ruby Gem

DATE: 5/14/2013

AUTHOR: Larry W. Cashdollar (@_larry0)

DOWNLOAD: http://rubygems.org/gems/cremefraiche, http://www.uplawski.eu/technology/cremefraiche/

DESCRIPTION: Converts Email to PDF files.

VENDOR: Notifed on 5/13/2013, provided fix 5/14/2013

FIX: Version in 0.6.1

CVE: 2013-2090

DETAILS: The following lines pass unsanitized user input directly to the command line.
A malicious email attachment with a file name consisting of shell meta characters could inject commands into the shell.

If the attacker is allowed to specify a filename (via a web gui) commands could be injected that way as well.

218 cmd = "pdftk %s updateinfo %s output %s" %[pdf, infofile, tfile] 219 @log.debug('pdftk-command is ' << cmd) 220 pdftkresult = system( cmd)

GREETINGS: @vladz,@quine,@BrandonTansey,@sushidude,@jkouns,@sub_space and @attritionorg

ADVISORY: http://vapid.dhs.org/advisories/cremefraiche-cmd-inj.html
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